blood relation vs sib

blood relation and sib both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood relation	Yes	No	No	No
sib	Yes	No	No	No

As nouns, blood relation and sib are synonyms defined as:

blood relation and sib: one related by blood or origin; especially on sharing an ancestor with another

Other synonyms of blood relation include blood relative, cognate.

blood relation (noun)	sib (noun)
one related by blood or origin; especially on sharing an ancestor with another	one related by blood or origin; especially on sharing an ancestor with another
	a person's brother or sister